#include <bits/stdc++.h> using namespace std; unordered_map<char,int> record={{'A',10},{'B',11},{'C',12},{'D',13},{'E',14},{'F',15}}; int main() { string s; while(cin>>s){ int n=s.size(),p=1; int res=0; for(int i=n-1;i>=1;i--){ if(s[i...